Numbers

 

Any letter can take the place of a number.  A letter that takes the place of a number is called a variable.

Here's an example:

Rather than writing 3 + __ = 7, you can write 3 + a = 7.  In this equation the letter a = 4.

The letter "a" is called a variable because it can stand for different numbers.  It comes from the word vary, which means to change.

Solve the following equations by determining what number the variable is taking the place of.

 

b + 3 = 11

b =

4 + a = 9

a =

x + 8 = 12

x =

   
7 + a = 16

a =

3 + y =6

y =

b + 0 = 17

b =

   
a + 5 =10

a =

6 + x = 14

x =

a + 9 = 13

a =

   
4 + c =7

c =

9 + x = 19

x =

a + 13 =27

a =

   
x + 15 = 35

x =

12 + n = 24

n =

10 + a = 35

a =

   
n + 23 = 52

n =

x + 11 = 67

x =

21 + a = 44

a =

   
33 + s = 98

s =

18 + a = 36

a =

77 + x = 99

x =

   
32 + b = 43

b =

t + 14 = 28

t =

w + 18 = 29

w =

   
12 + x = 60

x =

s + 9 = 45

s =

t + 24 = 48

t =

 

 

Elementary & Middle School Lessons & Self-Correcting Tests for Children in all Subject Areas.
If you have found an error or would like to make comments on this lesson, please email us at:
MySchoolhouse.online@gmail.com

Copyright 1999-2024 by Educational Designers, LLC.  All rights reserved.
Lessons & Tests in Math, Reading, Spelling, Science, Language, and Social Studies.

"This site uses cookies from Google to deliver its services and analyze traffic. Your IP address and user-agent are shared with Google along with performance and security metrics to ensure quality of service, generate usage statistics, and to detect and address abuse."
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
WORK SPACE